Sectional-lining construction for mills



B. A. MITCHELL AND F. G. JANNEY.

SECTIONAL LINING CONSTRUCTION FOR'MILLS. APPLICATION HLEI) HzB. I7,1917.

1,370,699. Patented Mar. 8, 1921.

. 2 S.HEETS SHEET 1- B. A. MITCHELL AND F. G. JANNEY.

SECTIONAL LINING CONSTRUCTION FOR MILLS.

APPLICATION FILED FEB-17,191?- 1,370,699. Patented Mar. 8, 1921.

F7 2 SHEETS-SHEET 2- mwmu J, i I; jg;

UNITED STATES PATENT OFFICE.

rmrmnr "A. mrrcnnm. AND rmx a. uzmnr, or GARFIELD, UTAH.

SEGTIONAL-LINING CONSTRUCTION FOB MILLS.

Patented Mar. 8, 1921.

Original application flled Kay 27, 1916, Serial No. 100,841. Divided andthis application filed February 17', 1917. Serial No. 149,338.

To all whom it may concern:

'Be it known that we, BENJAMIN A. Mrronnm. a citizen of the UnitedStates, residin "at arfield, in the county of Salt Lake and State ofUtah, and FRANK G. JANNEY, a citizen of the United States, residing atGarfield, in the county of Salt Lake and said joints.

application cover broadly another form of grinding mill described andclaimed in our copending application Serial No. 149,339, filed Feb. 17,1917.

Among these advantages are the construction of the shell in sectionshaving interlocking joints with fastening devices external to Thesefastening devices are preferably bolts passing through holes in flangesand when these holes are so located that they are wholly exterior to thejoints in the shell, there is no possibility of leakage through saidholes.

Another featured this invention lies in 8a the lining which is made inhollow cylin drical sections having helical edges and a grate at one endof the mill held in place by 'said sections. The helical edges of thesections cause a longitudinal movement thereof when any slight rotarydisplacement takes place, thereby crowding and locking the grate as'wellas the sections more firmly in place.

- 'Other features and advantages of our improved mill will appear in thefollowingspecification when taken in connection with the accompanyingdrawings, in which- Figure 1 is a longitudinal section partly inelevation of a rotary mill with our improvements applied thereto.

Fig. 2 is a cross-section of the same partly in section.

Fig. 3 is an edge view of a circular lining member which lies againstone head of the mill.

Fig. 4 is a sectional view of said lining member.

ig. 5 is a sectional view of a cylindrical lining member.

Fig. 6 is a sectional view of another cylind r1cal lining member, beingthe one which hes agalnst the grate at one end of the mill.

Flg. 7 is a detailed elevation of a portion of the circular liningsection at the end of the mill.

.Fig. 8 is a detailed elevation of a portion of one of the cylindricallining sections.

Referring to the accompanying drawings, it will be seen that the shellof the mill is composed of sectional members 10, 11, 12, etc. Themembers 11 are semi-cylindrical in form, while the members 10 and 12 aresubstantially circular and fiat and close the ends of the cylindricalspace formed by the sections 11. At the center of the ends or headslO'and 12, are hollow journal members 13 and 151 which are suitablyfitted to supporting bearings 15 and 16. Attached to the journal 13 is afeeding scoop 17 The ore picked up by said scoop is caused to enter themills through the hollow lining 18 of the journal 13. The lining 18 hasa helical internal rib 18 to cause an inward movement of the material. Asimilar discharge passage 19, comprising a hollow, lining fitted to thejournal 14, is provided. Adjacent the head 10 of the mill is a grate, orlining member 20, whichis provided with a. pluf, rality of fine openingsfor egress of the pulverized ore in the mill while retaining the largerparticles. This grate is of special construction, not forming thesubject-matter of the present a plication, but is fully described in oura ove mentioned co-pending application r. No. 100,341.

'Thef'sections of the shell are interlocked by means of slightly beveledshoulders 22, 23 and 24. Bolts 25, 26 and 27 firmly draw the sectionstogether and cause a tight joint at said shoulders. Similar bolts 28 and30 cause a'tight joint at the shoulders 29 and 31 where the journals areattached to the heads of the mill.

The rate 20 lies against the fiat seat 32 inthe ead 10 of the mill, anda hollow cylindrical lining member 33 bears upon the grate on theopposite side in a manner such as to press it against said seat. Othercylindrical lining sections 34 and 35 of the same general dimensions areplaced within the shell in alinement with the section 33 and bear uponsaid section and each other at their edges. The edges of these sectionswhere they bear upon each other are of helical form sloping in onedirection through a portion of their circumference, and of a similarform sloping in the opposite direction through another portion of theircircumference. By means of this helical form of the edges, it will beseen that any rotary displacement of the sections in either directionwill cause them to be pushed longitudinally and to become more firmlylocked.

tion upon the contents of the mill.

Between the sectional lining members above described and the outershell, are placed blocks 45 of wood or other absorbent fibrous materialwhich are adapted to expand when wet and thus become firmly locked inplace. They thus firmly lock the sectional lining members in positionand permit the assembling of the parts of the structure while they arein a dry condition.

The outlet passages in the head it) are separated by ribs 21 which haveradial posi-tions and which form additional seats for the grate 20. Atsuitable intervals, as shown at 46, bolts 48 are passed through theseribs and into the inner section mem bers 47, which are fitted to theinner aperture in the grate. This lining member 47 is also suitablyfitted to the outlet lining member 19 to provide a continuous outletpassage for the pulverized material.

It will be seen that we have provided a new construction which may bevery conveniently assembled and which when in operation is of very firmand rigid construction. It will be seen that there are no opportunities.for leaking for the reason that the fastening devices for the outershell sections are entirely exterior to the joints in said sections. Itwill also be seen that should anypossible rotary displacement of thelining sections take place, the sections as well as other arts of themill, are held more firmly loc ed by said displacement.

, While we have described our invention more or less precisely asregards the details of construction, we do not wish to be limitedthereto unduly as we contemplate changes in the construction andform ofthe parts and the substitution of equivalents without departing from thespirit of our invention.

, What we claim is:

1. The combination in a rotary grinding mill having inlet and outletopenings, of a grate adjacent said outlet opening, and looking means forsaid grate tending to increase its pressure on said grate during theoperation of said mill.

:2. The combination in a rotary grinding mill having inlet and outletopenings, of a grate adjacent said outlet opening, and means including aplurality of parts located within said mill for exerting anincreasinglocking pressure on said grate by the relative movement of said parts.

3. The combination in a rotary grinding mill having inlet and outletopenings, of a grate adjacent said outlet opening, and a liningcomprising. a plurality of parts adapted by relative movement thereof toex ert a locking pressure on said grate and to set up a locking pressurebetween the parts of sald lining.

4. In a. rotary grinding mill of the class described having inlet andoutlet openings, a grate adjacent said outlet opening, and meansincluding a lining for said mill for automatically effecting anincreasing pressure on said grate when said mill is in operation andthereby efiecting the simul-- taneous securing of said lining againstmovement, said llnlng bemg composed of alined hollow cylindricalsections, one of which abuts against said grate.

5. In a rotary grinding mill of the class described, having inlet andoutlet openings, a grate adjacent theoutlet opening, a seat for saidgrate, and a lining for said mill engaging said grate opposite saidseat, said lining being formed of interlocking relatively movablesections, said sections having contacting edges of helical form.

.6. A rotary grinding mill of the class described comprising a shell,and a plurality of continuous relatively movable circular liningsections located within said shell and contacting .with eachother alongtheir lateral edges to form a cylindrical liningfthe contacting edges ofsaid sections being inclined to a plane normal to the axis of rotationof said mill. j;

7. The combination in a rotary grinding mill, of an outer shell, atubular lining located in said shell, and an end lining.

mounted at the end of said tubular lining, said tubular lining and saidend lining having coacting inclined surfaces respectively for setting upa locking pressure between said lining members upon relative movementthereof.

8. The combination in a rotary grinding mill, of an outer shell, and acylindrical lining extending throughout the length of said shell, saidlining being formed of a plurality of substantially cylindricalcomplemencular lining members interposed between said end members-andcoacting with each other along their lateral edges, said coacting edgesbeing inclined to a plane normal to the axis of rotation of said mill,said sections being capable of relative rotation limited by the pressureset up between them.

10. In a rotary grinding mill of the class described, having inlet andoutlet openings, a lining for said mill formed of hollow cylindricalsections capable of limited relative movement, said sections being inaxial alinement and bearing upon each other at their edges, said edgesbeing inclined in one direction in one portion of the circumference andin an opposite direction in another portion of the circumference, and ashell for said mill.

11. In a rotary grinding mill of the class described having inlet andoutlet openings,

a lining for said mill formed. of hollow cylindrical sections bearingupon each other at their edges, said edges of'said sections havinginclined surfaces adapted to increase the pressure between the coaotingedges upon relative rotative movement of said sections, and a lining forthe inlet opening of said mill adapted upon relative rotation thereofwith respect to said mill to increase the pressure between saidcylindrical sections.

12. In-a rotary grinding-mill of the class described, having inlet andoutlet openings, a lining for said mill formed of hollow cylindricalsections, said sections being in axial alinement and bearing upon eachother at their edges, said edges being inclined in one direction in oneportion of the circumference and in an opposite direction in anotherportion of the circumference, a flat circularlining section at one endof said mill, said section having oppositely inclined surfaces to matchthe oppositely inclined edges of the adjacent cylindrical liningsection, and a shell for said mill.

13. The combination in a rotary grinding mill ofan outer shell, and alining comprising a plurality of relatively movable parts havingcoacting surfaces adapted to exert a locking pressure between saidlining and said shell upon relative movement of said parts, where y saidlining is maintained in position without being attached to said shell.

14. The combination ina rotary grinding.

mill, of a shell comprising a cylindrical body portion and circular endwalls, said cylindrical body portion being formed in sections havingoutwardly extending longitudinal flanges at their joints, said bodyportion and said end walls having radially extending flanges at the endsof said shell, said flanges being provided with wedging surfaces, andmeans extending through said flanges for uniting the parts of saidshell;

In testimony whereof, we have subscribed our names.

BENJAMIN A. MITCHELL. FRANK G. JANNEY. Witnesses:

L. M. Fos'rnn; O. W. KUMROW.

